package com.dfbz.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
@WebFilter(urlPatterns = {"/user/*","/meet/*","/dept/*","/article/*"},dispatcherTypes = {DispatcherType.FORWARD,DispatcherType.REQUEST})
public class LoginFilter implements Filter{

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        HttpSession session = req.getSession();
        String sId = session.getId();
        Object userId = session.getAttribute(sId);//会话ID
        if (null==userId){
            //未登录，重定向登录首页
            resp.sendRedirect(req.getContextPath()+"/index.jsp");
            return;
        }
        chain.doFilter(req,resp);
    }

    @Override
    public void destroy() {

    }
}
